SUPPLEMENTAL ACCOUNT BALANCES - Schedule of Other Noncurrent Assets (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| SUPPLEMENTAL INFORMATION [Abstract] | ||
| Operating lease right-of-use assets | $ 71 | $ 83 |
| Deferred financing costs - Revolving Credit Facility | 16 | 20 |
| Emission reduction credits | 11 | 11 |
| Fair value of commodity derivative contracts | 20 | 101 |
| Funded pension | 105 | 97 |
| Postretirement plan | 20 | 19 |
| Other | 45 | 42 |
| Other noncurrent assets | $ 288 | $ 373 |
| X | ||||||||||
- Definition Defined Benefit Plan, Funded Pension, Noncurrent No definition available.
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| X | ||||||||||
- Definition Emission Reduction Credits, Noncurrent No definition available.
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| X | ||||||||||
- Definition Supplemental Information No definition available.
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| X | ||||||||||
- Definition Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's right to use underlying asset under operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer. No definition available.
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| X | ||||||||||
- Definition Amount of noncurrent assets classified as other. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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